We just purchased a new oven. The instructions said that the racks were coated with a vegetable oil. Does this pose any kashrus problem?

In recent years it has become common for oven racks to be coated before they are shipped to consumers. Since we cannot confirm the kosher status of the oils used in that process, we recommend that you kasher the racks before you use them for the first time. In this case, the kashering is quite simple : just turn the oven on to 550 F and leave it at that temperature for one hour.